CAAnimation – 改变animation最后一帧的属性？

我正在animation一个UIView（或更确切地说它的CALayer），在animation结束时，它不再可见（我做了一个3D变换，使它围绕y旋转了90°，想象一个门向你开启），虽然它在技​​术上“可见”，因为它的框架仍然在屏幕上。

在animation结束时，我从animationDidStop：finished：方法的超级视图中移除了该视图。

问题是，有一个简短的闪烁，你看到它的原始未转换状态之前，它被删除的视图。

我想知道如何解决这个问题。 我不知道。 我试图animation层的不透明度，但也没有工作。 闪烁仍然发生。

有任何想法吗？ 我可以提供任何东西，或者也许有人在这里有过这个问题吗？

编辑：这里有一些代码（向下滚动，并寻找内部如果（isHalfDone）其中[子视图removeFromSuperview];

- (void) pageOpenView:(UIView *)viewToOpen duration:(NSTimeInterval)duration pageTurnDirection:(PageTurnDirection) p{ // Remove existing animations before stating new animation [viewToOpen.layer removeAllAnimations]; // Make sure view is visible viewToOpen.hidden = NO; // disable the view so it's not doing anythign while animating viewToOpen.userInteractionEnabled = NO; float dir = p == 0 ? -1.0f : 1.0f; // for direction calculations // create an animation to hold the page turning CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"]; transformAnimation.removedOnCompletion = NO; transformAnimation.duration = duration; transformAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]; CATransform3D startTransform = CATransform3DIdentity; if (p == NEXT_PAGE) { startTransform.m34 = 0.001f; }else { startTransform.m34 = -0.001f; } // start the animation from the current state transformAnimation.fromValue = [NSValue valueWithCATransform3D:startTransform]; // this is the basic rotation by 90 degree along the y-axis CATransform3D endTransform = CATransform3DMakeRotation(3.141f/2.0f, 0.0f, dir, 0.0f); // these values control the 3D projection outlook if (p == NEXT_PAGE) { endTransform.m34 = 0.001f; endTransform.m14 = -0.0015f; }else { endTransform.m34 = -0.001f; endTransform.m14 = 0.0015f; } transformAnimation.toValue = [NSValue valueWithCATransform3D:endTransform]; // Create an animation group to hold the rotation CAAnimationGroup *theGroup = [CAAnimationGroup animation]; // Set self as the delegate to receive notification when the animation finishes theGroup.delegate = self; theGroup.duration = duration; // CAAnimation-objects support arbitrary Key-Value pairs, we add the UIView tag // to identify the animation later when it finishes [theGroup setValue:[NSNumber numberWithInt:viewToOpen.tag] forKey:@"viewToOpenTag"]; // We set the tag to the page number [theGroup setValue:[NSNumber numberWithInt: p] forKey:@"PageTurnDirection"]; [theGroup setValue:[NSNumber numberWithBool:YES] forKey:@"isAnimationMidpoint"]; // ie is this the first half of page-turning or not? // Here you could add other animations to the array theGroup.animations = [NSArray arrayWithObjects:transformAnimation, nil]; theGroup.removedOnCompletion = NO; // Add the animation group to the layer [viewToOpen.layer addAnimation:theGroup forKey:@"flipViewOpen"]; } - (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { // Get the tag from the animation, we use it to find the animated UIView NSNumber *tag = [theAnimation valueForKey:@"viewToOpenTag"]; PageTurnDirection dir = [[theAnimation valueForKey:@"PageTurnDirection"] intValue]; BOOL isHalfDone = [[theAnimation valueForKey:@"isAnimationMidpoint"] boolValue]; UIView *toStack; // the stack the page has moved from UIView *fromStack; // the stack the new page will go to. int indexDirection; // will be either 1 or -1 int targetLastPageInStack; // the page number that wants to get added to its stack (ie either high or low) // depending on which direction we are turning, we search a different stack if (dir == NEXT_PAGE) { fromStack = rightStack; toStack = leftStack; indexDirection = 1; int lastPg; UIView *lastPgInStack; if ([fromStack.subviews count] > 0) { lastPgInStack = [fromStack.subviews objectAtIndex:0]; if ([lastPgInStack tag] == pageIndex) { lastPg = pageIndex; // pagenr of currently last page in stack. } else { // there was no last page, so the current page is the last page lastPg = [lastPgInStack tag]; } }else { lastPg = pageIndex; } targetLastPageInStack = lastPg + 2; } else { fromStack = leftStack; toStack = rightStack; indexDirection = -1; int lastPg; UIView *lastPgInStack = [fromStack.subviews objectAtIndex:0]; if ([lastPgInStack tag] == pageIndex-1) { lastPg = pageIndex-1; // pagenr of currently last page in stack. } else { // there was no last page, so the current page is the last page lastPg = [lastPgInStack tag]; } targetLastPageInStack = lastPg - 2; } // different handling if the page turning is half done, or fully done. if (isHalfDone) { UIView *subview = [fromStack viewWithTag:[tag intValue]]; if (flag) { // Now we just hide the animated view since // animation.removedOnCompletion is not working // in animation groups. Hiding the view prevents it // from returning to the original state and showing. subview.hidden = YES; [subview removeFromSuperview]; // REMOVE THE ANIMATED PAGE FROM THE STACK // now create one on that stack if ((dir == NEXT_PAGE && targetLastPageInStack <= self.endPageIndex) || (dir == PREV_PAGE && targetLastPageInStack >= self.startPageIndex)) { BODBookPage *newPage = [BODBookPage pageInBook:&myDocumentRef pageNum:targetLastPageInStack frame:fromStack.bounds] ; newPage.hidden = NO; [fromStack insertSubview:newPage atIndex:0]; } } // now create the view for the page that'll be turned over and add it to the right stack. Probably set it to hidden as well. BODBookPage *newPage = [BODBookPage pageInBook:&myDocumentRef pageNum:[tag intValue] + 1*indexDirection frame:toStack.bounds] ; newPage.hidden = YES; [toStack addSubview:newPage]; [self pageCloseView:newPage duration:turningTime/2.0f pageTurnDirection:dir]; } else { // we just animated the page turning from up to over // now have to remove the most distant view, so the view at subview index 0. We do this to keep memory usage low. if ([toStack.subviews count] > 1) { [(UIView*)[toStack.subviews objectAtIndex:0] removeFromSuperview]; } pageIndex = pageIndex + 2*indexDirection; } } 

Answer 1

这是问题的答案：它是关于animationfillMode属性 。